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Adding gmail account to Thunderbird

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I have an existing Gmail account. I have repeatedly tried to add that account to Thunderbird. I enter all the required data and click on done. I am sent to Gmail to login to authorize Thunderbird access. When I click Allow Thunderbird indicates that either the username or password is invalid. Both are valid as I use them both to login to my Gmail account. I have Imap turned on for that Gmail account. I have checked all the Gmail suggested settings and all looks ok.

I have an existing Gmail account. I have repeatedly tried to add that account to Thunderbird. I enter all the required data and click on done. I am sent to Gmail to login to authorize Thunderbird access. When I click Allow Thunderbird indicates that either the username or password is invalid. Both are valid as I use them both to login to my Gmail account. I have Imap turned on for that Gmail account. I have checked all the Gmail suggested settings and all looks ok.
Iqhotyoshelwe imifanekiso ekwisikrini

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What's your version of TB? Some versions in the 60 or 68 branches had OAuth2 bugs.